Voltage unstable on 3.5 digit voltmeter Lascar SP200? How to make more stable?

[F4Spook]

Hello, I recently purchased a 3.5 digit LCD voltmeter for a small project. Its to measure the voltage of an AA battery. When I hook it up the readings fluctuate quite a bit when
compared to my multimeter. I'm a bit of an electronics noob so I am not sure how to smooth out the reading. Any info would be greatly appreciated.

I am using a bench supply to power the LCD.

This is the component:

https://www.lascarelectronics.com/media/5874/sp-200.pdf

 

[KlausST]

Hi,

we see a lot of cables. More than I expect.
I can not see which is used for what.
Does the wire carry current ot not?
Does the battery supply any device or not?

So it´s not clear to me whether:
* the voltage fluctuation at the measurement nodes are true or not
* it´s a wiring problem
* it´s a power supply problem
..

Hard to give advice.

I recommend to keep the wiring as simple and as short as possible.
Then do new tests and tell us what happens.


Use a battery (3x AA or 3x AAA) to supply the voltmeter .. then tell us what happens.

Klaus

 

[F4Spook]

Thank you Klaus I will give that a go.